<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary" @click="AddRoleDialogVisible=true">添加角色</el-button>
                </el-col>
            </el-row>
            <el-table :data="rolesList" border stripe :header-cell-style="table_header" empty-text="拼命加载中">
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row
                        :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
                        v-for="(item1, i1) in scope.row.children"
                        :key="item1.id">
                        <!-- 一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{ item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                        <!-- 二级和三级 -->
                            <el-col :span="19">
                            <!-- 通过for循环 渲染二级权限 -->
                                <el-row
                                :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                                v-for="(item2, i2) in item1.children"
                                :key="item2.id"
                                >
                                    <el-col :span="6 ">
                                        <el-tag
                                        type="success"
                                        closable
                                        @close="removeRightById(scope.row, item2.id)"
                                        >{{ item2.authName }}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag
                                        type="warning"
                                        v-for="(item3) in item2.children"
                                        :key="item3.id"
                                        closable
                                        @close="removeRightById(scope.row, item3.id)"
                                        >{{ item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index" label="序号" width="100px" align="center"></el-table-column>
                <el-table-column label="角色名称" prop="roleName" align="center"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc" align="center"></el-table-column>
                <el-table-column label="操作" width="300px" align="center">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.id)">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeRoleById(scope.row.id)">删除</el-button>
                        <el-button
                        type="warning"
                        icon="el-icon-setting"
                        size="mini"
                        @click="showSetRightDialog(scope.row)"
                        >分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限 -->
        <el-dialog
        title="分配权限"
        :visible.sync="setRightDialogVisible"
        width="50%"
        @close="setRightDialogClosed"
        >
        <el-tree
            :data="rightsList"
            :props="treeProps"
            ref="treeRef"
            show-checkbox
            node-key="id"
            default-expand-all
            :default-checked-keys="defKeys"
        ></el-tree>
        <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
        </el-dialog>
     </div>   
</template>

<script>
import Qs from 'qs'

export default {
    data () {
        return {
            // 所有角色列表
            rolesList: [],
            // 分配权限框
            setRightDialogVisible: false,
            // 权限列表
            rightsList: [],
            //  树形控件的属性绑定对象
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            //   默认选中节点ID值
            defKeys: [],
            //   添加用户对话框
            AddRoleDialogVisible: false,
            // 添加角色表单
            addRoleForm: {},
            //   添加角色表单验证
            addRoleFormRules: {
                roleName: [
                { required: true, message: '请输入角色名称', trigger: 'blur' }
                ],
                roleDesc: [
                { required: true, message: '请输入角色描述', trigger: 'blur' }
                ]
            },
                  //   当前即将分配权限的Id
            roleId: 0
        }
    },
    created () {
        this.getRolesList()
    },
    methods: {
        table_header(row, column, rowIndex, columnIndex){
            return 'background-color: rgb(102,177,255);color: white;font-size:16px;'
        },
        async getRolesList() {
            const { data: res, status: status } = await this.axios.get('roles')
            if (status !== 200) {
                return this.$message.error('获取角色列表失败！')
            }
            // console.log(res.data);
            this.rolesList = res.data
        },
         // 根据ID删除对应的权限
        async removeRightById (role, rightId) {
            // 弹框提示 删除
            const confirmResult = await this.$confirm(
                '此操作将永久删除该权限, 是否继续?',
                '提示',
                {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }
            ).catch(err => err)
            // 点击确定 返回值为：confirm
            // 点击取消 返回值为： cancel
            if (confirmResult !== 'confirm') {
                this.$message.info('已取消权限删除')
                return
            }
            const { data: res, status: status } = await this.axios.delete(
                `roles/${role.id}/permissions/${rightId}`
            )
            if (status !== 200) {
                return this.$message.error('删除权限失败！')
            }
            role.children = res.data
            this.$message.success('删除权限成功！')
            
            //   不建议使用
            // this.getRolesList()
        },
        // 分配权限
        async showSetRightDialog (role) {
            this.roleId = role.id
            // 获取角色的所有权限
            const { data: res, status: status } = await this.axios.get('permissions/tree')
            if (status !== 200) {
                return this.$message.error('获取权限数据失败！')
            }
            //   获取权限树
            this.rightsList = res.data
            //   console.log(res)
            //   递归获取三级节点的id
            this.getLeafkeys(role, this.defKeys)

            this.setRightDialogVisible = true
        },
        // 通过递归 获取角色下三级权限的 id, 并保存到defKeys数组
        getLeafkeys (node, arr) {
            // 没有children属性，则是三级节点
            if (!node.children) {
                return arr.push(node.id)
            }
            node.children.forEach(item => this.getLeafkeys(item, arr))
        },
        // 权限对话框关闭事件
        setRightDialogClosed () {
            this.defKeys = []
        },
        // 分配权限确定
        async allotRights () {
            // 获得当前选中和半选中的Id
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            // join() 方法用于把数组中的所有元素放入一个字符串
            const idStr = keys.join(',')
            const { data: res, status: status} = await this.axios.put(`roles/${this.roleId}/permissions`, Qs.stringify({pids: idStr }))
            if (status !== 200) { return this.$message.error('分配权限失败！') }
            this.$message.success('分配权限成功!')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    }
}
</script>
<style lang="less"scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>